Increasing RAM has decreased PC performance
ASUS P5N32-SLI Premium motherboard with Intel Core Duo 2.4Ghz CPU.
Windows XP SP2 MCE 2005.
Maximum addressable memory with 32bit XP is 3.25GB.
I recently upgraded the above motherboard from 2x1GB 533Mhz DDR2 DIMMs to 4x1GB 667Mhz DDR2 DIMMs. All 4MB is detected by the BIOS and 3.25GB of it is addressed by XP. Great. :-)
Except not so great :-(
If I use up to .9GB memory, performance is fine
If I use between .9GB and 1.1 GB memory, performance tails off
If I use more than 1.1GB memory, the PC becomes slower than an asthmatic ant with some heavy shopping (to badly quote Captain Black Adder)
None of the memory sticks appear faulty because if I install 2GB by taking any two of the four DIMMs, performance is fine. It is only when I exceed 2GB that I have a problem.
My mobo handbook states that 667Mhz DDR2 is fully supported, as does the Crucial website.
I've written to Crucial for help, but would appreciate the wisdom of expert PPRuNers, please!
Cheers
XV105